Thanks to Istria´s geographical particularities, the position of water springs (the Mirna valley) and the location of inhabitants and tourism development, water supply unfolds through constant water potential energy exchange. Water is pumped from springs to between 200 and 300 meters above the sea level and via gravitational pipes further transported to the distribution tanks situated approximately 60 meters above the sea level. The automation and the optimization of pumping operation according to the electricity tariff and water demand is reducing the cost of pumping, but during this process water´s potential power is lost to various forms of energy. The lost hydro energetic potential could well be saved and utilized through small hydro power plants and newly created energy could sold on the renewable electical energy market.